Cognomen โอยามะ (Ohyama 
, Ooyama 
, โอยามะ 
) , in the entire world, is a rare surname. The surname โอยามะ is habitual in Japan, where it is a very rare surname, Argentina, and the United States. Likewise, โอยามะ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Ohyama | Brazil, China, Argentina, United States, Japan |
| Ooyama | Philippines, United States, Japan |
| โอยามะ | Thailand |